Most of what's on there is pretty good. For a 1000 ft overview, I'll let you pick one or both of these.
This is his personal "flat earth Journey " talking about the process and the evidence that brought him from globe believer to flat earther:
https://www.youtube.com/watch?v=J0lko_TfYyM
Cool. There's hundreds of channels and thousands of videos out there, hard to know where to start, but this channel is probably in my top 5 https://www.youtube.com/channel/UC3Z5IVoNE5cP2kka5svUEBw/videos
Most of what's on there is pretty good. For a 1000 ft overview, I'll let you pick one or both of these.
This is his personal "flat earth Journey " talking about the process and the evidence that brought him from globe believer to flat earther: https://www.youtube.com/watch?v=J0lko_TfYyM
This is a good one that high-level pokes holes in the current accepted model: https://www.youtube.com/watch?v=NAZC9rkJ5ok
Both are highly recommended to someone new to the topic.
Good for you being willing to look.